package com.webserver.core;

import com.webserver.http.HttpServletRequest;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

/**
 * 负责与指定客户端进行一次HTTP交互
 * HTTP协议要求客户端与服务端采取一问一答的交互规则.
 * 并在交互完毕后断开TCP连接
 *
 * 因此,这里处理一次HTTP交互采取的过程分为三部分:
 * 1:解析请求(读取客户端发送过来的HTTP请求内容)
 * 2:处理请求(分析请求信息确定客户端意图,并进行对应的处理)
 * 3:发送响应(给浏览器发送一个HTTP中的响应,将处理结果回复给浏览器)
 */
public class ClientHandler implements Runnable{
    private Socket socket;

    public ClientHandler(Socket socket){
        this.socket=socket;
    }

    public void run() {
        try {
//1.解析请求
            HttpServletRequest request=new HttpServletRequest(socket);
       //2.处理请求
            String path=request.getUri();

       //3.发送响应
            File file=new File("./webapps"+path);
            //3.1发送状态行
            String line="HTTP/1.1 200 OK";
            println(line);
            //3.2发送响应头
            println("Content-Type: text/html");
            println("Content: "+file.length());
            println("");
            //3.3发送响应正文
            OutputStream out=socket.getOutputStream();
            FileInputStream fis=new FileInputStream(file);
            byte[] data=new byte[1024*10];
            int len;
            while ((len=fis.read(data))!=-1){
               out.write(data,0,len);
            }
            System.out.println("响应发送完毕!");



        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //交互后与客户端断开连接(协议要求)
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    private void println(String line) throws IOException {
        OutputStream out=socket.getOutputStream();
        byte[]data=line.getBytes(StandardCharsets.ISO_8859_1);
        out.write(data);
        out.write(13);//单独发送回车符
        out.write(10);//单独发送换行符
    }
}
